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Tuesday, December 1, 2015

Physical transmission medium lies in which layer of OSI reference model?

Open Systems Interconnection model - OSI model defines a networking framework to implement protocols in seven layers. OSI MODEL is conceptual model and it doesn't perform any functions in the networking process.
OSI Model Layer
Layer Data unit Function Examples
Host layers 7.  Application Data High-level APIs , including resource sharing, remote file access, directory services and virtual terminals HTTP , FTP , SMTP , SSH , TELNET
6.  Presentation Translation of data between a networking service and an application; including character encoding , data compression and encryption/decryption HTML , CSS , GIF
5. Session Managing communication sessions, i.e. continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes RPC,PAP,SSL,SQL
4. Transport Segments/Datagram Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing TCP, UDP, NETBEUI
Media layers 3. Network Packet Structuring and managing a multi-node network, including addressing, routing and traffic control IPv4, IPv6, IPsec,AppleTalk, ICMP
2. Data link Frame Reliable transmission of data frames between two nodes connected by a physical layer PPP , IEEE 802.2 , L2TP , MAC , LLDP
1. Physical Bit Transmission and reception of raw bit streams over a physical medium Ethernet physical layer , DSL , USB , ISDN , DOCSIS

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